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Metamaterial-based reconfigurable holographic surfaces (RHSs) have beenproposed as novel cost-efficient antenna arrays, which are promising forimproving the positioning and communication performance of integrated sensingand communications (ISAC) systems. However, due to the high frequencyselectivity of the metamaterial elements, RHSs face challenges in supportingultra-wide bandwidth (UWB), which significantly limits the positioningprecision. In this paper, to avoid the physical limitations of UWB RHS whileenhancing the performance of RHS-based ISAC systems, we propose a multi-band(MB) based ISAC system. We analyze its positioning precision and propose anefficient algorithm to optimize the large number of variables in analog anddigital beamforming. Through comparison with benchmark results, simulationresults verify the efficiency of our proposed system and algorithm, and showthat the system achieves $42\%$ less positioning error, which reduces $82\%$communication capacity loss.

Multi-band Reconfigurable Holographic Surface Based ISAC Systems: Design and Optimization